Cleaned up code, added support for lists, classes, attributes, and more. Added more test code, everything appears to be working. More cleanup and testing is needed.

src/index.html

@@ -12,6 +12,7 @@
     <main-app></main-app>
 </body>
 
-<script type="module" src="framework.js"></script>
+<script src="WebComponentsPolyfill.js"></script>
+<script type="module" src="main-app.js"></script>
 
 </html>